GB1292542A - Improvements relating to the speed control of an electric motor - Google Patents

Improvements relating to the speed control of an electric motor

Info

Publication number
GB1292542A
GB1292542A GB3633/70A GB363370A GB1292542A GB 1292542 A GB1292542 A GB 1292542A GB 3633/70 A GB3633/70 A GB 3633/70A GB 363370 A GB363370 A GB 363370A GB 1292542 A GB1292542 A GB 1292542A
Authority
GB
United Kingdom
Prior art keywords
thyristor
stator
motor
windings
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3633/70A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BBC Brown Boveri AG Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of GB1292542A publication Critical patent/GB1292542A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Multiple Motors (AREA)

Abstract

1292542 Control of A.C. motors BROWN BOVERI & CO Ltd 26 Jan 1970 [28 Jan 1969] 3633/70 Heading H2J A squirrel cage motor has a first set of stator windings 21, 23, 25 whose ends are joined to form star connections through diode bridges 31, 33, 35, each associated with one of a group of thyristors 41, 43, 45. The motor has a second stator with windings arranged like the first windings, the stator fields rotating at the same speed and in the same direction. The rectifier groups are operated at equal frequency but with mutual phase displacement whereby the star connections are successively and periodically opened and closed at a rate which differs from the mains frequency. The stator field rotates at the differential frequency to entrain the rotor. Regarding commutation, when thyristor 41 is conductive, for example, the star-connection of winding 21 is established. If the thyristor 43 is now triggered, capacitor 53 discharges so that a quenching current for the thyristor 41 is derived through commutation transformer 71. A choke 61 prolongs the cut-off period of the thyristor 41. By varying the mains frequency, the motor may operate above synchronous speed. Reversal and regenerative action is also provided.
GB3633/70A 1969-01-28 1970-01-26 Improvements relating to the speed control of an electric motor Expired GB1292542A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH148769 1969-01-28

Publications (1)

Publication Number Publication Date
GB1292542A true GB1292542A (en) 1972-10-11

Family

ID=4211599

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3633/70A Expired GB1292542A (en) 1969-01-28 1970-01-26 Improvements relating to the speed control of an electric motor

Country Status (8)

Country Link
US (1) US3617838A (en)
AT (1) AT296439B (en)
BE (1) BE744934A (en)
CH (1) CH479199A (en)
DE (1) DE1959115A1 (en)
FR (1) FR2029539A1 (en)
GB (1) GB1292542A (en)
SE (1) SE357474B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3684935A (en) * 1971-07-02 1972-08-15 Gen Motors Corp Circuit for dissipating the potential induced in each phase winding of a cycloconverter operated motor upon termination of conduction therethrough
US3758836A (en) * 1972-02-03 1973-09-11 F Shibata Electric control system for alternating current circuit
US4994684A (en) * 1989-01-30 1991-02-19 The State Of Oregon Acting By And Through The State Board Of Higher Education On Behalf Of Oregon State University Doubly fed generator variable speed generation control system
US5239251A (en) * 1989-06-30 1993-08-24 The State Of Oregon Acting By And Through The State Board Of Higher Education On Behalf Of Oregon State University Brushless doubly-fed motor control system
US5028804A (en) * 1989-06-30 1991-07-02 The State Of Oregon Acting By And Through The State Board Of Higher Education On Behalf Of Oregon State University Brushless doubly-fed generator control system
US5083077A (en) * 1990-07-31 1992-01-21 The State Of Oregon Acting By And Through The State Board Of Higher Education On Behalf Of Oregon State University Brushless doubly-fed generation system for vehicles
TW299522B (en) * 1992-05-13 1997-03-01 Naito Kinshiro
US7161257B2 (en) * 2004-03-08 2007-01-09 Ingersoll-Rand Energy Systems, Inc. Active anti-islanding system and method
CN102500669A (en) * 2011-09-29 2012-06-20 中国水利水电第五工程局有限公司 Stepless speed-regulating power system for rolling type copper waterstop forming machine

Also Published As

Publication number Publication date
BE744934A (en) 1970-07-01
DE1959115A1 (en) 1971-03-25
CH479199A (en) 1969-09-30
FR2029539A1 (en) 1970-10-23
US3617838A (en) 1971-11-02
SE357474B (en) 1973-06-25
AT296439B (en) 1972-02-10

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees